package com.cinco.server.config.security.component;

import com.cinco.server.utils.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * JWT登录授权过滤器
 * @author cinco
 * @version 1.0
 * @date 2022/1/12
 */
public class JwtAuthencationTokenFilter extends OncePerRequestFilter {
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        String authHeader = request.getHeader(this.tokenHeader);

        //存在token
        if (null != authHeader && authHeader.startsWith(tokenHead)){
            String authToken = authHeader.substring(tokenHead.length());
            String username = jwtTokenUtil.getUserNameFromToken(authToken);

            //token存在用户名但是未登录
            if (null != username && null == SecurityContextHolder.getContext().getAuthentication()){

                //登录
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);

                //验证token是否有效，重新设置用户对象
                if (jwtTokenUtil.validateToken(authToken,userDetails)) {
                    UsernamePasswordAuthenticationToken authenticationToken =
                            new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authenticationToken.setDetails(userDetails);
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }

        }
        filterChain.doFilter(request,response);
    }
}
